Core-forming appliance for patterns.



F. GAISLER CORE FORMING APPLIANCE FOR PATTERNS.

APPUCATION FILED SEPT; 10. 1917.

1 996,945 Patented Mar. 11, 1919.

mi i

Iwvawvon Uivrrm) STATES PATENT OFFICE.

FRED GAI'SLER, or s'r. Louis, MISSOURI, ASSIGNOR or ONE-HALF TOrnnneanr, m,

OF ST. LOUIS, MISSOURI.

V CORE-FORMING APPLIANCE FOR PATTERNS;

ToaZZ whom it mayconcern: r 1

Be it known that I, FRED GArsLER, a citizen of the United States ofAmerica, a resi dent of the city of St. Louis, in the State of Missouri,have invented certain new and useful Improvements in Core-FormingApplian-cesfor Patterns, of which the following is a full, clear, andexact description, reference being had to the accompanying drawings,forming a part of thisspecification.

My invention relates to improvements in patterns, and moreparticularlyto means whereby a green sand core can be formed at the time the mainpart of the mold is formed. The new-core-forming devicecan be used toform a straight core, uniform in diameter throughout its length, such,for example, as a car wheel core. The invention can be used in makingvarious kinds of cores which, owing to'the lack of draft, cannot beformed by the pattern itself. In the manufacture of car wheels it iscustomary to use dry sand cores, and the labor and expense of making andhandling such cores is entirely eliminated by the present invention.Furthermore, the green sand core formed by the new. device can be moreeasily removed from the casting, and since the core is formed as anintegral part of the green sand mold, there are no fins or rough cornersat the junction of 'the core and the 7 main body of sand.

The preferred form of the invention comprises a pattern provided with acore-receiving opening, and a core-forming sleeve arranged in saidopeningto form the core therein. The pattern can be lifted from thecore-forming sleeve, leaving the latter in the mold. This sleeve ispreferably made of segmental sections, separable from each other, sothey can be easily removed from the core after the pattern has beendrawn from the mold. V 7

With the foregoing and other objects in view the invention comprises thenovel construction, combination and arrangement of parts hereinaftermore specifically described and illustrated in the accompanying drawingswherein is shown the preferred embodiment of the invention; however, itis to be understood that the invention comprehends changes, variationsand modifications which com'e'within the scope of the claims hereuntoappended.

Figure I is a vertical section of a flask,

Specification'of Letters Patent. 7 Patented M31311, 1919,

Application filed September 10, 1917. Serial No. 190,486. 7

showing a pattern provided with a coreforming device constructed inaccordance with my invention.

Fig. II is an enlarged fragmentary plan view, partly in section, showingthe central portion of the pattern and the core-forming device arrangedtherein.

F ig..III is a vertical section illustrating the parts shown in Fig. II.

The flask herein shown comprises a drag l, a bottom board 2, a cope 3provided with a basin 4 into which the molten metal is poured, and gates5 through which the metal flows from the basin to the mold. A chill ring6 is arranged between the cope and the drag.

A designates a. pattern, preferably made of wood, the pattern shownbeing used in making car wheels. A tapered metal sleeve 7 forms a liningfor a core receiving opening at the center of the pattern, said sleevebeing permanently secured to the wooden pattern. This tapered sleeve islarger in diameter at the bottom than at the top, so that the patterncan be readily lifted from the core-forming device, which will bepresently described. 8-designates a sheet metal web closing the top ofthe core-receiving opening at the center of the pattern. The annularmargin of the web 8 is arranged between rings 9 and 10 and secured tothe pattern by means of screws 12, which pass through said rings.

B designates a core-forming device preferably consisting of twosemi-cylindrical sections 13 abutting. againsteach other at the pointsindicated by 14 in Fig. II. The internal diameter of the core-formingsleeve may be uniform throughout the entire length of the sleeve, andthe sleeve sections 13 may be separated from each other and removed fromthe core after the pattern has been removed from the mold. Each sleevesection 13 is provided on its outer face with tapered ribs 15, whichengage the inner face'of the tapered lining 7. The lower edge of eachsleeve section 13 is widened, or flanged outwardly, as shown at 16, toengage the relatively large lower margin of the lining 7. The upper edgeof each sleeve section 13 is fitted to the sheet metal web 8 at the topof the core-receiving opening, the lower edge being flush with thebottom of the pattern and firmly fitted to the lining 7 Web 8. The partsare thus secured to,

gether in such a manner that'the pattern can be readily lifted from thecore-forming sleeve B, and thereafter said sleeve may be 7 easilyremoved from the core by moving the sleeve sections 13 away from eachother. By splitting the sleeve longitudinally to form the two segmentalsections 13, and by combining these sections with a pattern asv hereinshown, a highly desirable core can be made of green sand at a very lowcost, thereby entirely eliminating the labor and expense due to themaking and handling of dry sand cores. The pattern having the taperedcore-receiving opening can be very easily removed from the sectionalcore-forming sleeve, and the latter can be easily and quickly removedfrom the core.

I claim:

1. A car wheel pattern provided with a central core-receiving opening, asheet metal web closing the top of said corereceiving opning, acore-forming sleeve arranged in said opening and extending from saidsheet metal web to the bottom of the opening, the internal diameter ofsaid coreforming sleeve being uniform approximately throughout thelength of the sleeve and said sleeve being split longitudinally so thatit can be readily removed from the core, said core forming sleeve beingremovably fitted to the pattern and the parts being so formed that thepattern can be readily lifted from 7 said sleeve;

2. A; car Wheel pattern provided with a separable from the pattern andseparable from each other so they can be readily removed from the core,the wall of said cen; tral core-receiving opening being tapered to allowthe pattern to be readily lifted from said sectional core receivingsleeve, and said'sections beingwidened at their lower margins to engagethe relatively large lower margin of said wall.

3. A pattern provided with a core-receiving opening, a closure for thetop of said 1 core-receiving opening, said opening being open at thebottom to receive the sand, and

a core-forming sleeve arranged in said opening and extending from saidclosure to the bottom of the opening, said coreforming sleeve beingsplit longitudinally so that it can be readily removed from the core,said core-forming sleeve being removably fitted to the pattern and theparts being so formed that the pattern can be readily lifted from-saidsleeve. 7

In testimony that I claim the foregoing I hereunto afiix my signature.

' FRED GAISLER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G. V

